Lock-washer for nuts.



B. E. D. STAFFORD & E. l. DODDS.

LOCK WASHER FOR NUTS. APPLICATION man FEB. 18. 1911;.

WITNESSES 7 e '[NVENTORS g. e 461d m7 .JI. I W

Patented Feb. 20, 1917.

i Wm Attamey-r m NORRIS PETERS co PNUm-UYMQ. WA 504 me you. 0

Y or inclines more abruptly towardthe roller and rests in the path of movement of'the,

wh ch limit the rotation of the roller. These j stops 9 in the'end walls of the opening 6, are

. jdiagonally disposed, that is to say, one-is on mamas-Imam News;

Application fileartrfi r 18,1916; serialiivofvaies,

To all whom it mayconcern:

Be it known that we, BENJA1\I-I'N E. D. STAFFORD and ETHAN I. Donosfcitizens of the United States, and residents-'iof Pittsburgh, in the county offillegheny' and State of Pennsylvania, have invented certain new and useful Improvements in l LocloWashers for Nuts; and we dohereby declare the'fo'l lowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. I

Our invention relates to an improvement in lock washers for nuts,-and it consists in the details of construction as will be more fully explained and pointed out in theclaims. g

In the accompanying drawings, Figure 1 is a view in plan of a washer embodying our inventlon; Flg. 2 is an enlarged v1ew 1n eleradially through the Washer at one side of the latter. Its shortest diameter is'slightly greater than the thickness of the washer'5, so that when turned with its longest diameter in the plane of the washer, its'shortest diameter will project slightly at each sideof the washer to engage the nut and the fishplate or other part against which the washer rests when in use. 7 By this construction it will be seen that when the washer withour 7 improved clamping roller is between a nut and fish plate or other part, the projecting teeth 'or roughened edges of the roller will engage I both the'rear face of the nut and the adjacent face of the fishplate; As, shown in Fig. 3, the end wal'lsof the opening 6 in washer 5 are slightly inclined as at 8, from one end to a point near the other end, where it bends longends of the latter thus formingstops 9 one end wall near one face of the washer, and

: Sp'ecification of r te ere.

the other is on the other end wall adjacent the other face ofjtlie washer and opeiate'to:

'rota t'ion'of the roller in' one'idi'rec limit the tion..---' l The stops are so dispo'sed on the washer that the movementof the nut when being screw d onto a b ltwi11 and to turn' fthe roller and hold its longer. ends in contact with the stops orseats 9, while a reverse ro- 7 tation of the nut, as in unscrewing, will WESTA F ie BENJAMIN E. D; sTaFFoRD AND E'riiAN I. nonns, or rrrrsnuiaon,rENNsYnvaNIii, 1" V "ASSIGNORS T0, ELANVNERYV'IB0LT1COMIBANY,GOF PITTSBURGH, PENNSYLVANIA.

,7 Pa tenteiFieb. 1917; if

cause the roller to turnand bear against the nut with gradually increasing force. As the longer ends of the elliptical roller move outwardly through the opening 6, one end thereof will be in contact with the'fish plate or other part and theother end in contact with the inner face of the nut,'hence a continued unscrewing movement ofthe nut, and the'resultant turning oftherollentends to move. the-side of the washer carrying the roller away from the fish plate and toward the nut, while thepart of the roller bearing against the nut engages the latter with increasing i pressure due'to themovement of the washer and theturning ofthe'roller on its axis and absolutely prevents a nut. that has been loose;

Normally the roughened faces project screwed home on its bolt, from working g screwed home, andjas the roller is free'to} turn in the direction of unscrewing turning] movement ofth nut, it follows that after a nutha's been once looked, all chances of accidental movement of the nut 1s overcome.

.By;making the roller or gripping member 7 elliptical, it engages the nut and fish plate,

in unscrewing movement of thenut with a gradually increasing pressure and a con stantly changing bitin'gsurface,due to cam shape of the roller. 'As the roller bears on the fish plate or other fixed obj ect,",and 1 00 against the reariface of the nut, a very slight movement of the nut is's ufficient to turn the must be removed, to crush the roller;

. roller to a position where the nut cannot-be removed except by the application of sufii-f- 7 v "cientpressura-as for instance where the nut 1' If desired however we may provide the washer with a pin hole-10, shown'in Fig. 4' through which a pin may be inserted, tov en- V gage the roller and lock the} same against 1 turning movement. 1 10 Having fully described our invention what We claim as new and desire to secure by Letters-Patent, is

1. Ar lock Washer having an opening through the same, and an elliptical roller having a roughened face and mounted in said opening, the shortest diameter of said roller being slightly greater than the thickness of the washer so as to project beyond both faces of the washer when the roller is in its normal unlocking position;

2. A look washer having .an opening through the same and diagonally disposed stops on the end walls ofsaid opening and an elliptical roller mounted in said opening Copies of this patent may be obtained for and adapted to" be limited in its turning movement by contact with saidstops, the shortest diameter of said roller being slightly greater than the thickness of the washer so as to project beyond both faces of the washer when the roller is in its normal unlocking position.

In testimony whereof, we have signed this specification in the presence of two subscribing Witnesses.

BENJAMIN ,E. D. STAFFORD. ETHAN I. DODDS. Witnesses:

EDWIN S. RYon, F. H. ALLISON.

five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

